The package appx-compiler was found to contain malicious code.
mitre ttp
T1195.001
// versions and what to do
Malicious
all versions
Clean
none confirmed
Remove it from every machine and lockfile it reached. Treat any credentials, tokens and SSH keys present on those machines as exposed and rotate them. Check CI runners and container images that installed it.
Tracked for PyPI packages. HuggingFace models declare Python dependencies, so npm packages are not covered.
cvss
0.0
critical
severity band, no base score published
epss
not scored
chance of exploitation in 30 days
xyz score
0.0
medium
CyberXYZ composite out of 10
fig. 01 — GHSA-8q2c-2396-hf7j, the advisory selected below
// 1 advisories
GHSA-8q2c-2396-hf7j
CRITICAL
All versions of appx-compiler contain malicious code. The package uploads system information to a remote server, downloads a file and executes it.
// recommendation
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer.
The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
// cvss v3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Checked 2026-10-04 at 01:11 UTC. The most recent advisory here was published 2020-09-03. Updated continuously from NVD, GHSA, OSV and CNA feeds.